Quantitative Aptitude Mensuration

The diameter of the base of a cone is 1.5 times its height. If its curved surface area is 480\(\pi \) cm2, then its slant height (in cm) is:

1
\(20\sqrt 5 \)
2
\(10\sqrt 5 \)
3
\(10\sqrt 2\)
4
\(20\sqrt 2\)

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